The Jackhammer Driving Kit (JDK) is great for large projects where the fastest installation is desired. The JDK Jackhammer Adapter Kit comes with a driving bit and HSP-T4 hammer spacer. The jackhammer bit (OH-01) fits a standard 1⅛” jackhammer chuck. The included HSP-T4 works with 4×4 wood posts, the purchase of an additional spacer may be required and will be noted with each product.
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